Does anybody know Lt. Uhara wasn't on the final episode of the thrid s

I just finished watching the last episode of third season, which of course final for the series as well. Does anybody know, why Lt Uhara wasn't on the final episode? It would seem that all the regular cast would be on board for the final episode but that wasn't the case here...

They absolutely knew it was the last one while filming it. In the book STAR TREK LIVES, Joan Winston recounts her week-long visit to the set of "Turnabout Intruder." She says that after the last shot was finished, workmen started tearing down the Enterprise interior sets.

Re: Does anybody know Lt. Uhara wasn't on the final episode of the thr

Uhura is present in James Blish's novelisation of "Turnabout Intruder", and was presumably in the script version as well. Lt. Martine was evidently a last minute replacement due to Nichols unavailability.